Audio System with Navigation: Overview Saab 9-4X I

Navigation System Description and Operation

Each item in the list below represents topics covered in detail below.

1. Audio System Description
2. Navigation System Components
3. Navigation Radio
4. Global Positioning System (GPS) Antenna
5. Route Guidance
6. Voice Recognition
7. Points of Interest
8. Traffic Information
9. Weather Information

Audio System Description

The Navigation radio operates similar to a traditional radio. For information on the audio description and operation, see RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION .

OnStar Description and Operation

This OnStar® system consists of the following components

1. Telematics Communication Interface Module
2. OnStar® button assembly
3. Microphone
4. Cellular antenna
5. Navigation antenna
6. Bluetooth ® antenna (If Equipped)
7. Back Up Battery (If Equipped)

This system also interfaces with the factory installed vehicle audio system.

Mobile Identification Number and Mobile Directory Number

The telematics communication interface module utilizes 2 numbers for cellular device identification, call routing and connection, a mobile identification number and a mobile directory number. The mobile identification number represents the number used by the cellular carrier for call routing purposes while the mobile directory number represents the number dialed to reach the cellular device.

Operation of the OnStar® Speech Recognition Systems

OnStar® users communicate with 2 speech recognition systems. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over a phone line. The computer tries to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

1. Personal Calling uses a speech recognition system that resides in the vehicle. When the user presses the phone button, the system states, Ready, and listens for the user command. The user can speak commands to control the hands-free phone.
2. Virtual advisor is a remote speech recognition system that the caller can access by making a phone call. The user connects to virtual advisor by requesting it during personal calling use. The user is then transferred to the virtual advisor server and talks to it via a cellular connection.

The OnStar® speech recognition systems use speech technology that is designed to understand a wide range of American English speakers. Although there is no one right way to speak English, the system will work best when users try to modify their pronunciation should they encounter difficulty. Users who do not obtain good results are advised to try the tips and workarounds found in this section.

Radio/Audio System Description and Operation

The entertainment system on this vehicle may have several different configurations available to it. To determine the specific configuration of the vehicle, please see the Service Parts ID Label, and refer to RPO CODE LIST .

The entertainment system on this vehicle is configured with either a base or an uplevel system. The base and uplevel systems each contain a radio, antenna, speakers, and on some systems an audio amplifier. The uplevel system differs from the base system by providing the customer with enhanced audio system features. Some of those features may include the radio data system (RDS), an audio amplifier, programmable equalizer, and digital satellite radio (U2K).

Each item in the list below represents topics covered in detail below.

1. Radio Circuit Operation
2. Radio/HVAC Communications
3. Radio/HVAC Controls
4. Antenna System
5. AM/FM Reception
6. Digital Radio Receiver (If equipped)
7. Speaker Operation
8. Audio Amplifier (If equipped)
9. Radio Data System (RDS) (If equipped)
10. Theft Deterrent
11. OnStar ®
12. Steering Wheel Controls (If equipped)
13. Auxiliary Audio Input Jack (If equipped)
14. USB Port (If equipped)
15. Multimedia Player Interface Module (If equipped)
16. Noise Compensation (If equipped)
17. Speed Controlled Volume (SCV) (If equipped)

Speaker Operation

Speakers turn electrical energy into mechanical energy to move air, using a permanent magnet and an electromagnet. The electromagnet is energized when the radio or amplifier (if equipped) delivers current to the voice coil on the speaker. The voice coil will form a north and south pole that will cause the voice coil and the speaker cone to move in relation to the permanent magnet. The current delivered to the speaker is rapidly changing alternating current (A/C). This causes the speaker cone to move in two directions producing sound.

Amplifier Operation

The purpose of the amplifier is to increase the power of a voltage or current signal. The output signal of an amplifier may consist of the same frequencies as the input signal or it may consist of only a portion of the frequencies as in the case of a subwoofer or midrange speaker. The radio creates a low level stereo audio output signal, which is sent at the user-defined volume level to the audio amplifier. The audio amplifier amplifies the signal and sends it to the appropriate speakers. Each of the audio output channel circuits (+) and (-), from the amplifier have a DC bias voltage that is approximately one half of battery voltage. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

Video Entertainment System Description and Operation

Each item in the list below represents topics covered in detail below

1. Seatback Display Circuit Operation
2. Seatback Display System Components
3. Video Screens
4. Remote Control
5. Wireless Headphones
6. Video Inputs Only

Circuit/System Description

The radio receives a vehicle speed signal from the electronic brake control module (EBCM) in order to correlate actual vehicle speed to the movement of the vehicle calculated by the navigation system and reported serial data.

Description and Operation

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The radio communicates with the radio/HVAC control via serial data. This DTC indicates a fault in the radio/HVAC control. No external circuits are involved. The radio may continue to respond normally to faceplate functions when this DTC is set.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The multi-band antenna is located on the roof of the vehicle. The radio antenna is enabled when the radio is turned on. The radio provides battery voltage to the antenna using the center conductor of the antenna coaxial cable. When a 12 V signal is seen on the center conductor of the antenna coax, both AM and FM signals are amplified.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. The digital radio receiver is connected to the digital radio antenna via a shielded coax cable.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

When the radio is on, a discrete 12 V signal is supplied on the entertainment remote enable circuit to the Audio Amplifier and the Seatback Video Displays (if equipped). The signal is used to control the output status of the components

NAVIGATION SYSTEM DESCRIPTION AND OPERATION

When the radio is initially installed in the vehicle, the radio receives VIN information via serial data. The radio stores a portion of the VIN and compares this sequence to the VIN information received each time the radio powers on. The VIN in the radio is a single onetime learn.

The radio theft deterrent system is intended to disable or limit radio functionality if incorrect vehicle information is received by the radio. The radio disables functionality if the VIN information received by the radio does not match the VIN information that has been learned by the radio. This DTC is generated by the module when the Theft Protection is activated.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The radio amplifier control circuit provides varying pulse width modulated (PWM) signals to control overall muting of the amplifier. The PWM signals are varying duty cycle percentages ranging from 0-100 percent. A low duty cycle unmutes all amplifier channels and a high duty cycle mutes all amplifier channels. The amplifier control circuit will measure less than 1 V when the mute function is OFF, and approximately 8 V DC when at full mute.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The radio can command the seatback video display mode on vehicles equipped with rear seat entertainment (RSE) video. The radio utilizes discreet mode control circuits to each display to control the screen display mode via a pulse width modulated signal. If the display screen does not receive a signal, the display screen will operate in a default full screen mode.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The radio can control the seatback video display brightness on vehicles equipped with rear seat entertainment (RSE) video. A single brightness control circuit is used by the radio to control the display screen brightness for both displays via a pulse width modulated signal. If the display screen does not receive a signal, the display screen will operate at default brightness, which is a middle brightness level.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module provides the cellular phone microphone with a supplied voltage on the cellular phone microphone signal circuit. When the microphone is in use, voice data from the user is sent back to the telematics communication interface control module on the signal circuit. The telematics communication interface control module provides a ground for the cellular phone microphone via the low reference wire.

ONSTAR DESCRIPTION AND OPERATION

Navigation antenna is connected to the telematic module for the communication interface and to the radio via the navigation's centre conductor. The centre conductor sends the navigation signal to both the telematic control module communications interface and navigation radio. The telematic module supplies 5 V to the antenna to power the internal amplifier thorough the centre conductor of the antenna coax cable.

When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter.

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2. «RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION»(ref-652254-S32594284792014082300000)

The cellular phone and navigation antenna is connected to the telematics communication interface control module. This module supplies 5 V to the cellular phone and navigation antenna to power the internal amplifier. When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the GPS signal to both the telematics communication interface control module and the navigation radio. The navigation radio supplies 5 V through the GPS antenna coaxial cable to the navigation signal splitter to power the internal navigation radio signal amplifier.

ONSTAR DESCRIPTION AND OPERATION

The OnStar®button assembly consists of 3 buttons, Call/Answer, OnStar®Call Center, and OnStar®Emergency. The telematics communication interface control module supplies the OnStar®button assembly with 10 V via the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the keypad signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been activated.

ONSTAR DESCRIPTION AND OPERATION

The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

ONSTAR DESCRIPTION AND OPERATION

The audio/video adaptor allows the connection of audio and video signals from an external device such as a camcorder, video game console or MP3 player to the rear seat entertainment system. The middle jack is for left audio (white), the right jack is for right audio (red), and the left jack is for video (yellow). The system requires standard RCA cables to connect your external device to the RCA jacks. The auxiliary audio and video circuits are connected to the radio.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone's information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

ONSTAR DESCRIPTION AND OPERATION

The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. The digital radio receiver is connected to the digital radio antenna via a shielded coax cable.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module provides the cellular phone microphone with a supplied voltage on the cellular phone microphone signal circuit. When the cellular phone microphone is in use, voice data from the user is sent back to the telematics communication interface control module on the signal circuit. The telematics communication interface control module provides a ground for the microphone via the low reference wire.

ONSTAR DESCRIPTION AND OPERATION

When an OnStar® keypress is made, a serial data message is sent to the audio system to mute all radio functions and output OnStar® originated audio. After the audio system is muted, the telematics communication interface control module transmits signals to the audio system on the audio signal and audio common circuits.

ONSTAR DESCRIPTION AND OPERATION

The navigation antenna is connected to the telematics communication interface control module. The module supplies 5 V to the antenna to power the internal amplifier thorough the center conductor of the antenna coax cable.

When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter.

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2. «RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION»(ref-652254-S32594284792014082300000)

ONSTAR DESCRIPTION AND OPERATION

The telematics communication interface control module has the capability of commanding the horn, initiating door lock/unlock, or operating the exterior lamps using the serial data circuits. These functions are commanded by the OnStar® Call Center per a customer request.

ONSTAR DESCRIPTION AND OPERATION

The OnStar®button assembly consists of 3 buttons, Call/Answer, OnStar®Call Center, and OnStar®Emergency. The telematics communication interface control module supplies the OnStar®button assembly with 10 V via the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the keypad signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been activated.

ONSTAR DESCRIPTION AND OPERATION

AM and FM radio reception is dependent on the following components

1. Radio antenna
2. Coax cable between the radio antenna and the radio
3. Radio

The multi-band antenna is located on the roof of the vehicle. The radio antenna is enabled when the radio is turned on. The radio provides battery voltage to the antenna using the center conductor of the antenna coaxial cable. When a 12 V signal is seen on the center conductor of the antenna coax, both AM and FM signals are amplified.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module is a cellular device that allows the user to communicate data and voice signals over the national cellular network. When an OnStar keypress is made, the telematics communication interface control module activates and connects the system to the cellular carriers communication system by interacting with the national cellular infrastructure. The module sends and receives all cellular communications over the cellular phone and navigation antenna and cellular antenna coax.

ONSTAR DESCRIPTION AND OPERATION

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The infrared remote signal is used to transmit signals from the rear seat entertainment (RSE) remote control via pulse width modulated (PWM) signals to the radio. When a key on the remote is pressed, the remote control sends an infrared message to the infrared receiver located in the DVD display. The infrared receiver converts these infrared signals into a frequency and sends the message to the radio to perform the appropriate function. Both seatback displays contain receivers for the infrared remote, which are connected to common (+) and (-) signal circuits to the radio.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The driver seatback DVD display contains the infrared transmitter for the wireless headphones. The audio that is sent over the DVD audio signal circuits is a varying AC voltage. The transmitter processes the signal and transmits the audio signals to the headphones. If the display is in the closed position, the infrared signals will not be available for the operation of the wireless headphones and the remote control.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module is capable of interpreting voice commands received over the cellular microphone circuits. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over the cellular communication network. The module attempts to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

ONSTAR DESCRIPTION AND OPERATION

Circuit-/System description

The radio/HVAC controls are powered via the battery and ground. The radio checks the current status of the controls via a monitor circuit. Communication between the radio control and the radio is via the CGI circuit.

Communication between HVAC control and the HVAC module is via a separate LIN circuit. The HVAC module communicates the status information to the radio via GMLAN for HVAC information display.

Description and use

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The radio/HVAC controls are powered by the battery and ground. The radio/HVAC controls control the radio functions via the serial data messages. The radio-/HVAC controls communicate requests to the info display module with LIN serial data. The Info Display module communicates these requests to the radio via CGI serial data.

Communication between HVAC controls and the HVAC module is via a separate LIN circuit. The HVAC control module communicates the status information to the radio via GMLAN for HVAC information display.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The information display is equipped with battery voltage and ground. Radio controls voltage status of the display via wake-up circuit. The display's background lighting strength and graphic data is communicated over the data circuit.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The information display module is equipped with battery voltage and ground. Radio controls voltage status on the display via wake-up circuit. The display's background lighting strength and graphic data is communicated over the data circuit.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION